@morph @Chalkllate in the normal grocery shops in the UK you rarely see anything but pretty generic green and red chillies with the look of jalapeño or cayenne varieties about them, sometimes they might venture a scotch bonnet in the bigger cities... and that's about it really. There's a tiny bit more range in good indie South Asian shops - though usually not much more than just Scotch Bonnets, sometimes Habs, and often larger milder pointy pale green and yellows types.
But that's why we grow our own! :) Hopefully over 20 varieties this year for us.